波场合成与波场分析的有源房间补偿方法

Active listening room compensation based on wave field synthesis and wave field analysis

波场合成是一种空间声重放技术,利用扬声器阵列在宽阔的听音区域内重建声场。为消除或者消减听音房间的反射对重建波场的影响,利用测量环绕听音区域的闭合曲线上声压和声压梯度来分析波场,推导了基于圆形阵列进行波域分解的公式,利用多通道逆滤波进行了平面波域的房间补偿,实验结果显示该算法在整个听音区域内都是有效的。与传统补偿方法相比,边界元法所需的测量传声器数目少计算复杂度低,而波域分解具有更充分的波场分析能力,因此是一种更有效的有源房间补偿方法.

Wave field synthesis is a spatial sound field reproduction technique aiming at authentic reproduction of auditory scenes within the entire listening area. However, the reflection in the listening room interferes with the auralized wave field and may impair the spatial reproduction. This paper proposes an active compensation approach based on plane wave decomposition and multichannel inverse filtering with the sound pressure and pressure gradient measured on the closed curve surrounding the listening area. The experiment results have shown that the algorithm is effective on the entire listening area. In contrast to other conventional compensation algorithms, this boundary element method requires fewer measurement channels and the plane wave decomposition has sufficient ability to analyze the reproduced sound field.